clc;
clear;
close all;

img = imread('crop/1.png');
img = im2double(img);

[~,~,imxy] = my_gradient(img);
s1 = mean(imxy(:));
disp(s1);

function [imx,imy,imnorm] = my_gradient(im)

imx = [im(:,end,:) - im(:, 1,:),-diff(im,1,2)];
imy = [im(end,:,:) - im(1, :,:);-diff(im,1,1)];
imnorm = sqrt(imx.^2 + imy.^2);

end

 

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